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| Effects of Drip Irrigation with Saline Water on Cotton Yield, Soil Physical and Chemical Properties, and Soil N2O Emission |
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| KeyWord:saline water; drip irrigation; nitrogen fertilizer; cotton yield; soil physical and chemical properties; N2O emission |
| Author Name | Affiliation | | ZHANG Wen | Department of Resources and Environmental Science, Shihezi University, Shihezi 832003, China | | ZHOU Guang-wei | Department of Resources and Environmental Science, Shihezi University, Shihezi 832003, China | | MIN Wei | Department of Resources and Environmental Science, Shihezi University, Shihezi 832003, China | | MA Li-juan | Department of Resources and Environmental Science, Shihezi University, Shihezi 832003, China | | HOU Zhen-an | Department of Resources and Environmental Science, Shihezi University, Shihezi 832003, China |
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| Abstract: |
| This field study was conducted to investigate the effects of irrigation water salinity and N application rates on cotton yield, soil physical and chemical properties, and soil N2O emission. The experiment included three levels of irrigation water salinity：0.35, 4.61, and 8.14 dS·m-1, referred as fresh water, brackish water, and saline water, respectively. The N application rates were 0 and 360 kg·hm-2（a commonly used rate by local farmers）. In the first year of the study, cotton yields were highest in the brackish water treatment, 6.50% higher than in the fresh water treatment and 22.46% higher than in the saline water treatment. In the subsequent years, cotton yields decreased with increasing irrigation water salinity. As irrigation water salinity increased, soil moisture, soil salinity, and soil NH+4-N concentrations increased significantly, but soil pH, organic matter contents, total N concentrations, and NO-3-N concentrations decreased. Irrigation with either brackish or saline water significantly reduced activities of soil nitrate reductase and nitrite reductase, whereas applying N fertilizer promoted their activities. Soil N2O emission was significantly decreased by irrigation with salt-containing water. On the contrary, it was increased by N application. Soil N2O emission was correlated positively with soil organic matter, NH+4-N, NO-3-N, nitrate reductase activity, and nitrite reductase activity, but negatively with soil moisture. Soil pH, soil salinity, and total soil N had no significant effects on N2O emissions. |
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